CPT® Code 49412

Placement of interstitial device(s) for radiation therapy guidance (eg, fiducial markers, dosimeter), open, intra-abdominal, intrapelvic, and/or retroperitoneum, including image guidance, if performed, single or multiple (List separately in addition to code for primary procedure)

The CPT® Code 49412 refers to the placement of interstitial devices for radiation therapy guidance, specifically in the context of open procedures performed in the intra-abdominal, intrapelvic, and/or retroperitoneal areas. Interstitial devices, which include fiducial markers and dosimeters, play a crucial role in enhancing the precision of radiation therapy. Fiducial markers, often made of gold, are small seeds implanted in or around a malignant tumor to help accurately direct radiation towards the tumor while minimizing exposure to surrounding healthy tissues. This targeted approach is essential for effective cancer treatment, as it maximizes the radiation dose to the tumor while protecting adjacent organs and structures from potential damage. Dosimeters, on the other hand, are implantable devices that measure the radiation dose delivered at the tumor site, providing valuable feedback on the effectiveness of the radiation therapy. The placement of these devices is typically performed prior to the commencement of radiation therapy to ensure optimal targeting and dosage. The procedure involves identifying the appropriate sites for placement, often utilizing imaging guidance to ensure accuracy. A local anesthetic is administered to minimize discomfort during the insertion of the devices, which are introduced through an introducer needle under radiologic guidance. The correct positioning of the markers and dosimeters is verified through imaging techniques to confirm their placement within or around the tumor. The open procedure described in CPT® Code 49412 emphasizes the importance of meticulous planning and execution in the placement of these interstitial devices, ensuring that they are positioned correctly to facilitate effective radiation therapy.